Give an event locals

LOCAL_LOAD and LOCAL_STORE name one of an event's 64 slots, what it holds
(a number, or an index of a list) and that list: slots start at 0 when an
event begins, are shared by its handlers, the walks in them and the folds
in those, and are never saved nor in the states' namespace. A handler uses
a slot for one thing, so its type is verified as a state's is; views have
no locals (IN_LOCALS: a handler's block, a walk in it, a fold in either;
stores only in a handler and its walks). A fold reading a local still runs
a leaf at a time (one value for every item) and a shaped fold takes one
only on its key's side. The signature table's where widens to 16 bits.

locals checks a handler that sums items into a local in a walk, counts in
a fold the items below it, keeps an index in a local and reads it back,
over 80 events against a model, and five refusals. server_rows' shop now
takes stock through an index local and counts in one.

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